diff --git a/main.c b/main.c
index 30f5d49..f90db9f 100644
--- a/main.c
+++ b/main.c
@@ -12,9 +12,15 @@
 #define OCT_NO_LUA_FILE 1
 #define OCT_LUA_FILE_NOT_FOUND 2
 #define OCT_LUA_FILE_MISSING_OCT_INIT 3
+#define OCT_HELP 4
+#define OCT_VERS 5
+#define OCT_INVALID_ARGUMENT 6
 
 #define OCT_LUA_FILENAME_SIZE 128
 
+#define OCT_VERSION "0.0"
+#define OCT_URL "https://git.thejerks.club/j4nk/open-card-table"
+
 
 int oct_type;
 
@@ -27,6 +33,8 @@ struct {
 	char lua_file[OCT_LUA_FILENAME_SIZE];
 } args;
 
+void usage();
+void version();
 int process_args(int argc, char* argv[]);
 int initialize_everything(char* lua_file);
 int deinitialize_everything();
@@ -35,13 +43,22 @@ int main(int argc, char* argv[]) {
 	int process_args_result = process_args(argc, argv);
 	switch (process_args_result) {
 	case OCT_NO_LUA_FILE:
-		fprintf(stderr, "No lua file given\n");
+		fprintf(stderr, "Error: No lua file given\n\n");
+		usage();
 		return EXIT_FAILURE;
 		break;
 	case OCT_LUA_FILE_NOT_FOUND:
-		fprintf(stderr, "Could not open file: %s\n", argv[argc-1]);
+		fprintf(stderr, "Error: Could not open file: %s\n", argv[argc-1]);
 		return EXIT_FAILURE;
 		break;
+	case OCT_HELP:
+		usage();
+		return EXIT_SUCCESS;
+		break;
+	case OCT_VERS:
+		version();
+		return EXIT_SUCCESS;
+		break;
 	}
 	struct tb_event ev;
 	int finish = 0;
@@ -73,7 +90,7 @@ int process_args(int argc, char* argv[]) {
 	// Set args.port to default
 	strncpy(args.port, OCT_DEFAULT_PORT, 6);
 
-	for (int i = 1; i < argc-1; i++) {
+	for (int i = 1; i < argc; i++) {
 		// argv's are guaranteed to be zero-terminated, so can use
 		// strcmp instead of strncmp
 		if (strcmp(argv[i], "-p") == 0) {
@@ -82,6 +99,20 @@ int process_args(int argc, char* argv[]) {
 				i++;
 			}
 		}
+		else if (strcmp(argv[i], "-h") == 0) {
+			return OCT_HELP;
+		}
+		else if (strcmp(argv[i], "-v") == 0) {
+			return OCT_VERS;
+		}
+		else {
+			if (i == argc-1) {
+				break;
+			}
+			else {
+				return OCT_INVALID_ARGUMENT;
+			}
+		}
 	}
 
 	strncpy(args.lua_file, argv[argc-1], OCT_LUA_FILENAME_SIZE);
@@ -105,9 +136,7 @@ int initialize_everything(char* lua_file) {
 	lua_getglobal(L, "oct_init");
 	lua_call(L, 0, 1);
 	int type = lua_tointeger(L, -1);
-	//printf("TYPE: %d\n", type);
 	if (type == OCT_TYPE_SERVER) {
-		// TODO make port a command line argument
 		if (!oct_network_server_init(args.port)) {
 			printf("Could not establish a socket on port %s\n", args.port);
 			return 0;
@@ -130,3 +159,19 @@ int deinitialize_everything() {
 	oct_tb_sprite_list_deinitialize();
 	return 1;
 }
+
+void usage() {
+	fprintf(stderr, "Open Card Table, version %s\n", OCT_VERSION);
+	fprintf(stderr, "%s\n", OCT_URL);
+	fprintf(stderr, "\n");
+	fprintf(stderr, "Usage: ./open_card_table [OPTIONS] FILE\n");
+	fprintf(stderr, "\n");
+	fprintf(stderr, "  -p\tPort on which to listen\n");
+	fprintf(stderr, "  -v\tPrint version and exit\n");
+	fprintf(stderr, "  -h\tPrint this message and exit\n");
+	fprintf(stderr, "\n");
+}
+
+void version() {
+	fprintf(stderr, "%s\n", OCT_VERSION);
+}